a.btn-main-banner {
    padding: 10px 20px;
    border: 2px solid #000;
    font-size: 16px;
    text-transform: uppercase;
    position: absolute;
}
a:hover.btn-main-banner {
    color: #000 !important;
}
.link-all-banner {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
}